On August 3, 1898, while building the White Pass & Yukon Route Railroad, Michael J. Heney, the company foreman and chief engineer was supervising some blasting at a place called Black Rock which is about 13 miles up the track from Skagway.
As the explosion went off, a huge slab of rock slid down over two men. At first, rumors flew that there were more casualties, but in the end it was confirmed that there were just two.
The company decided that there could be no better memorial to these two men than the rock and so a small memorial was placed there.
Over the years the names of Al Jeneux and Maurice Dunn have been given for the two men, although in all the research, I have yet to find any historical reference to confirm those names.